Repeating firearm



April c. a. SWEBILIUS I A REPEQIINGI FIREARM Filed March 5, 1943 3'Sheets-Sheet 1 WW}: 3 3 mm n w Mw 2% Z% Z W W Aprifi 1?, 1945. c. G. swjEBmus REPEATIN FIREARM Filed Mal-6h 5, 1945 5 Sheets-Sheet 2 Aprifi 17, 1945. c. G. SWEBILIUS ,7

REPEATING FI Filed March 5, 1943 S'Sheets-Sheet 3 v w Z Wu w .mw 2w w 0% M w Y|\1l/ Patented Apr. 17, 1945 UNITED STATES PATENT OFFICE REPEATING FIREARM Carl G. Swebilius, Hamden, Conn.

Application March 5, 1943, Serial No. 478,057

12 Claims.

The present invention relates to improvements in repeating firearms, i. e., firearms which are provided with magazines from which ball-cartridges may be sequentially fed' to the cartridgechamber of the firearm for being fired. More particularly, the present invention relates to improvements in the action-slide and associated elements of the firearm-structure, as will appear from the following.

One of the objects of the present invention is to provide a superior repeating firearm in which simple, reliable and effective means is provided for alternately covering and uncovering the ejection-opening thereof to respectively exclude foreign matter from the mechanism and to permit the ejection of cartridge-cases.

Another object of the present invention is to provide a superior firearm-structure of the character referred to which includes a receiver having an ejection-opening and an action-slide slidably coupled to the said receiver so asto alternately cover and uncover the ejection-opening of the receiver, while at the same time discharging the function of operating a breech-bolt.

A further object of the present invention is to provide a repeating firearm having an action slide mounted for reciprocation adjacent a receiver and in which a superior construction and arrangement is employed for guiding and retaining the said action-slide with respect to the said rec'eiver.

With th above and other objects in view, as will appear to those skilledin the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art and which are not claimed in any separate application.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1a is a broken view partly in side elevation and partly in vertical central-longitudinal section of the intermediate portion of a firearmstructure embodying the present invention and in which the action-slide, breech-bolt and associated parts are shown in their forward positions;

Fig. 1b is a simliar view of the portion of the firearm immediately forward of the portion shown in Fig. 10.;

Fig. 2 is a view similar to Fig. la but showing the action-slide and associated parts in their rearmo st positions;

Fig. 3 is a broken top or plan view of the portion of the firearm immediately above the boxmagazine with the parts in the same positions in ing material.

which they are shown in Fig. 141, but with the action-slide partly in section;

Fig. 4 is a transverse sectional view taken on the line 4-4 of Fig. la; y

Fig. 5 is a similar view taken on the line 5-5 of Fig, 1a;

Fig. 6 is a view similar to Fig. 5 but omitting the stock and with the guard-collar shown in position to permit the removal of the action-slide from the receiver;

Fig. '7 is a view in side elevation of the receiver and the rear portion of the barrel;

Fig. 8 is a broken detailed sectional view taken on th line 8-8 of Fig. '7;

Fig. 9 is a perspective view of the guard-collar detached and looking mainly toward the front face thereof;

Fig. 10 is a view in inside elevation of the action-slide, detached; and

Fig. 11 is a front-end view thereof.

The particular repeating firearm herein chosen for purposes of illustrating one embodiment of the present invention, is of the gas-operated selfloading type. The said firearm includes, in the main, a frame I5, a receiver l6, a barrel H, a stock l8 and a barrel-cover IS. The gas-operated self-loading firearm shown also includes a breech-bolt 20, an action-slide 2|, a connectinglink 22, a reciprocating gas-operated piston 23,

and a cylinder-fitting 24.

With the exception of the stock l8 and barrelcover IS, the parts above referred to are preferably formed of high-grade steel, while the said parts l8 and I!) are preferably formed of wood or other suitable heat-insulating and shock-absorb- The frame l5 above referred to is mainly of plate-like form and is formed on its lower edge with a loop-like trigger-guard 25 extending around a trigger 26 which controls the firing-mechanism of the firearm in any suitable manner not requiring detailed description herein.

The frame I5 is rigidly secured to the stock H3 in any suitable manner such, for instance, as by a bolt 21, while the said frame If: and receiver l6 are detachably secured together in any suitable manner not requiring detailed description.

cular form incross section, and a relatively 7 heavy body 3! brazed or otherwise rigidly united to the outer surface of'the said shell 30. Adjacent its rear end and hence about midway the length of the action-slide 2I viewed as a whole, the body 3I of the said action-slide is provided with an outwardly-projecting operating-handle 32 by means of which the said action-slide and hence the breech-bolt maybe manually op' erated when desired.

About midway of its length, the action-slide 2I isformed with a downwardly-opening recess 33 which receives a coupling-lug 34 projecting upwardly from the rear end of the connectinglink 22 before referred to, Adjacent and intersecting its recess 33, the action-slide 2I is formed with a horizontal slot 35 which also intersects the exterior periphery of the said action-slide both to, the frontand to the rear of the oper ating-handle 32 thereof.

' The coupling-lug 34 at the rear end of the connecting-link 22, is releasably held in place in the recess 33 in the action-slide 2|, by a pivotal coupling-lever 36 installed in the slot 35 of the said action-slide (as shown in Fig. 3) and acting as releasable coupling-means for the rear end of the connecting-link 22 in a-manner more fully.

shown and described in my co-pending application Serial No. 478,058,;filed March 5, 1943.

At its forward end, the connecting-link 22 is formed with a coupling-lug 31 extending downwardly through a clearance slot 38 formed in the upper portion of the cylinder-fitting 24. The said coupling lug 3! extends into coupled engagement with the rear portion of the piston 23 reciprocating in the longitudinal piston-chamber 40 formed in the cylinder ,24, as is shown in Fig. 1b.

At its forward end, the piston-chamber 40 just above referred to is connected by means of aligned gas-passages M and 42 to the bore 43 of thebarrel I! and respectively formed in the forward portion of the cylinder-fitting 24 and the adjacent portion of the barrel H, as is clearly shown in Fig. 1b. 1

' The piston 23 and hence, also, the parts .con-. nected thereto, are yieldingly urged forwardly by a helical breech-closing spring 44 having its forward end seated within the recessed rear-end of the piston 23 against the coupling-lug 31 and having its rear portion encircling a guiderod 45. .The rear end of the breech-closing spring 44 thrusts rearwardly against a bracket 46 (Fig. la) carrying the guide-rod and releasably attached to the forward under-face of the receiver I 6 immediately forwardly of the boxmagazine 41.

Returning now to the receiver I5,,it will be noted that the said receiver is of substantiallycylindrical form exteriorly and is formed at substantially-diametrically-opposite points with one of two longitudinal guide-grooves 4B and 49 which extend parallel with each: other. and With the longitudinal axis of the-receiver I 6. The said guide-grooves 48 and 49 terminate at their rear a short distance forwardly of the rear end of the The rear end receiver I6, and at their forward ends both of the said guide-groove 48 and 49 intersect the forward face of the said receiver.

The guide-grooves 48 and 49 in the receiver I6 respectively receive with a free sliding fit, guideribs 5i] and SI extending inwardly from the action-slide 2| at each of the respective opposite side-edges thereof, as is especially well shown in Figs. 4, 5, 6 and 11. Preferably, the guide-ribs E9 and, 5] are formed by bending the respective opposite side-edges of the sheet-metal shell 30 of the action-slide 2! prior to the brazing or other secureinent of the said shell to the body 3 Lin order to form, a, unitary action-slide such as 2|. As

thus constructed and arranged, the coaction of the surfaces of the guide-grooves 48 and 49 with the respective guide-ribs 50 and 5! serve to guide the reciprocating -movement of the action-slide 2| and hold the same against lateral separation from the receiver I6.

Immediately above the box-magazine 41, the receiver I6 is formed with an ejection-opening 52 leading upwardly from the axial passage 28 in the said receiver to the outer periphery of the lattentopermit the ejection of cartridge-cases therethrough when the breech-bolt 20 is moved rearwardly, following the discharge of the firearm, in a manner well understood in the art. Formed in the upper right side of the receiver IB' and leading rearwardly from the rear end of the ejection-opening 52 therein, is a longitudinal clearance-slot 53 adapted to receive with a sliding fit a lug 54 laterally projecting from the forward end of the breech-bolt 28. Formed in the receiver I5 just forwardly of and communicating with the ejection-opening 52 therein, is a locking-notch 55 in which the lug 54 of the breechbolt 2!! is normally located when the said breechboltis in its breech-closing position.

The outer end of the lug 54 of the breechbolt 20 projects into a cam-recess 56 (Fig. 1a) formed in the inner face of the action-slide 2| and acting on the said lug 54 to both turn the same to unlock and lock the breech-bolt and to reciprocate the said breech-bolt in a manner well understood in the art and broadly similar to the manner in which the breech-bolt of the wellknown Garand military rifle is operated.

As will be seen especially Well by reference to Fig. 8, the exteriorly-threaded stem I'Ia at the rear end of the barrel I'I extends forwardly of the front face of the receiver I6 when the said stem is firmly interlocked in the threaded passage I 5a, in the said receiver. Mounted upon the forward portion of the stem I Ia immediately forwardly of the front face of the receiver I6, is an internally-threaded guard-collar 58. The said guard-collar has its rear face normally seated against the forward face of the receiver I6 but is rotatable fromsuch position for purposes as will hereinafter appear.

In its rear face the guard-collar 58 above referred to, is formed at substantially diametricallyopposite points respectively with two detentpockets 59 and 60 alternately receiving the rounded forward end of a detent-plunger GI. The said detent-plunger BI is mounted for reciprocation in a forwardly-opening pocket 62 formed in the left side of the forward end of the receiver I6 and opening through the forward face thereof, as is especially Wellshown in Fig, 8. The said detent-plunger BI is urged forwardly by a helical detent-spring 63 interposed between the rear end of the said detent-plunger and the bottom wall of the pocket 62.

On what is normally its right side, the guardoollar 58 is formed with an eccentric stop-nose 64 projecting outwardly therefrom and of about 90 circumferential extent. The remainder of the circumferential extent of the guard-collar 58 is cylindrically contoured and substantially corresponds in diameter to the diameter of the cylindrically-contoured forward portionof the receiver l6. Immediately below its stop-nose 84, the said guard-collar 58 is formecl on its periphcry with a clearance-groove 65 which is normally slightly out of register with the guide-groove 48 in'the right side of the receiver i6. Substantially diametrically opposite the clearance-groove 65 just referred to, the guard-collar 58 is also formed on its periphery with a second clearancegroove 66 also normally slightly out of register .with the adjacent guide-groove 48 in the periphery of the receiver I6. Both of the aforesaid clearance-grooves 65 and 66 extend in parallelism with the longitudinal axis of the receiver l6 and hence in parallelism with the guidegroves 48 and 49 thereof. 7

Normally, the guard-collar 58 is held in its guard position in which it is shown in Figs. 1a, 2, 3, 5, 7 and 8, by the entry of the forward end of the detent-plunger 6| into its detent-pocket 60. In this position, the respective clearancegrooves 65 and 66 of the guard-collar 58 are out of registry with the guide-grooves Q8 and 49 of the receiver "5, so that the forward movement of the action-slide 2| is limited by the engagement of the edge of the gulde-ribs 58 and 5| with the rear face of the said guard-collar 58, Under the conditions just described, the stopnose 64 is interposed in the path of forward movement of the action-slide 2| and would, by itself. normally limit the forward travel of the said action-slide.

Should it be desired for any reason to dismount the action-slide 2| from the receiver E5, the unit comprising the receiver and barrel should first be detached from the stock and then the rear end of the connecting-link 22 should be uncoupled from the action-slide 2| by rocking the coupling-lever 35 and either totally removing or displacing the said connecting-link sufiiciently to clear it from the path of movement of the stop-nose 64. The breech-bolt 20 may now be disconnected from the action-slide 2| by moving the said breech-bolt to the limit of its rearward movement to thereby bring its relatively-slender forward end into the relatively large-diametered rear portion of the axial passage 28 in the receiver .lfi. The forward end of the breech-bolt may now be swung laterally to disengage its lug 54 from the cam-recess 56 in the action-slide 2|. The guard-collar 58 may now be rotated substantially one-half turn on the shank Ha of the barrel I! in a counter-clockwise direction (as viewed from the front) until the detent-pocket 59 of the guard-collar is brought into registration with the detent-plunger 6|. When thus shifted,

and yieldingly held by the detent-plunger 6|, theclearance-grooves B5 and 66 on the periphery of the said guard-collar will be brought into registration respectively with the guide-grooves 49 and 48 of the receiver l6 and the stop-nose 54 will be shifted into a position clear of the longitudinal path of movement of the action-slide 2|. By the turning movement of the guard-collar 58 as above described, the same will be brought into the position in which it is shown in Fig. 6.

Now the action-slide 2| may he slid forwardly until its rear end passes completely clear of the forward face of the guard-collar 58, whereupon the action-slide is completely free of attachment to the firearm-structure.

When the guard-collar 58 is in its normal position as is especially well shown in Figs. 2 and 5, its forward face is in position to be engaged by the rear face of a stop-finger 61 upstanding from the connecting-link 22, for purposes as will hereinafter appear.

When the firearm is discharged, gas under pressure will pass from the bore 43 of the barrel |T downwardly through the aligned gas-passages 42 and 4| and thence into the forward end of the piston-chamber 40 of the cylinder-fitting 24. .This gas will act on the forward end of the piston 23 to drive the said piston violently rearwardly. The rearward movement of the piston 23 will similarly move the connecting-link 22 rearwardly and hence will also rearwardly move the action-slide 2| which is coupled to the rear end of the said connecting link as before described. The rearward movement of the actionslide 2| will cause the said action-slide to act through the intermediary of its cam-recess 56 and the lug 54 of the breech-bolt 20, to first turn and then rearwardly retire the said breech-bolt and thus effect the extraction and ejection of the just-fired cartridge in a manner wellunderstood in the art. The ejection of the just-fired cartridge will occur through the ejection-opening 52 of the receiver I5 which becomes uncovered as a result of the rearward travel of the said action-slide.

The parts will continue their rearward travel against the tension of the breech-closing spring 44 until they assume substantially the positions in which they are shown in Fig. 2. It will be noted by reference to Fig. 2 that the rearward movement of the connecting-link 22 has been checked by the engagement of its stop-finger 6 1 with the forward face of the guard-collar 58. It will also be noted that the forward edge of the action-slide 2| has moved to a position substantially flush with the rear end of the ejectionopening 52 in the receiver l6.

Normally and immediately after having reached the positions in .which they are shown in Fig.2. the parts'will be restored to their forward positions under the urge of the breechclosing spring 44. This return or forward movement of the. parts will cause the breech-bolt 2D to remove afresh cartridge from the box -magazine Ill and insert the same into the cartridgechamber of the firearm in any suitable manner well understood in the art.

During its reciprocating movement, from the position in which it is shown in Fig. la to the position in which it is shown in Fig. 2 and vice versa, the action-slide 2| is accurately guided by the sliding of its, respective guide-ribs 58 and. 5| in the guide-groovesviB and 59 of the receiver It.

From the foregoing it willbe seen that the action-slide 2| when in its normal forward position. completely covers not only the ejectionopening 52 in the receiver Iii, but also covers the clearance-slot 53 and the locking-notch 55 of the said receiver to thereby efiectively exclude dirt, water and other foreign matter from entry into the interior of the receiver.

The invention may be carried out in other specific ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the. present embodirnents are, therefore, to be considered in all respects as illustrative and not restrictive, and

all changes coming within the meaning and equivalency range of the appended claims are intended to beembraced therein.

I claim:

1. A repeating firearm-structure including in combination: a frame-structure having an ejection-opening therein; a breech-bolt movable in the said frame-structure; a barrel projecting forwardly from the said frame-structure; an actionslide operatively connected to the breech-bolt, for moving the same and mounted on the said framestructure for movement with respect thereto, the said action-slide having a forward position in which it covers the ejection-opening in the said frame-structure and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slideinto its forward position; and a rotary stop-member mounted adjacent the forward end of the said frame-structure and having stop-means thereon normally projecting into the path of forward travel of the said action-slide, the said stop-member being rotatable in a direction transverse of the firearm-structure to shift the stop-means thereof into and out of the path of forward movement of the said action-slide.

2. A repeating firearm-structure including in combination: a frame-structure having an ejec tion-opening therein; a breech-bolt movable in the said frame-structure; a barrel rojecting forwardly from the said frame-structure; an action-slide operatively connected to the breech bolt for moving the same and mounted on the said fram'e structure for movement with respect thereto, the said action-slide having a forward position in which it covers the ejection-opening in the said frame-structure and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; and a rotary stop-member mounted on the rear portion of the said barrel adjacent the forward end of the said frame-structure for turning movement in a direction transverse of the firearm-structure, the said stop-member having stop-means thereon normally projecting into the path of forward travel of the said action-slide and movable out of the path of the said actionslide when the said stop-member is turned on the said barrel.

3. A repeating firearm-structure including in combination: a frame-structure having an ejection-opening therein; a breech-bolt movable in the said frame-structure; a barrel projecting forwardly from the said frame-structure and having external threads thereon located adjacent the forward end of the said frame-structure; an action-slide operatively connected to the said breech-bolt for moving the same and mounted on the said frame-structure for movement with respect thereto, the said action-slide having a forward position in which it covers the ejectionopening in the said frame-structure and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; and an internally-threaded ring-like stop-member mounted on the threaded rear portion of the said barrel for turning movement thereon in a direction transverse of the firearm-structure, the said stop-member having stop-means thereon normally projecting into the path of forward travel of the said action-slide and movable out of the path of the said actionslide when the said stop-member is turned on the said barrel.

4. A repeating firearm-structure including in combination: a frame-structure having an ejec-' tion-opening therein; a breech-bolt movable in the said frame-structure; a barrel projecting forwardly from the said frame-structure; an actionslide operatively connected to the breech-bolt for moving the same and mounted on the said framestructure for movement with respect thereto, the said action-slide having a forward-position in which it covers the ejection-opening in the said frame-structure and also having a rearward po sition in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; a rotary stop-member mounted adjacent the forward end of the said frame-structure and having stopmeans thereon normally projecting into the path of orward travel of the said action-slide, the said stop-member being rotatable in a direction trans verse of the firearm-structure to shift the stopmeans thereof into and out of the path of forward movement of the said action-slide; and detent-means for releasably holding the said stopmember in position to interpose its stop-means in the path of the said action-slide and also for releasably holding the said stop-member in a position wherein its stop-means is out of the path of the said action-slide.

5. A repeating firearm-structure including in combination: a receiver formed on its exterior with two parallel guide-grooves'extending longitudinally of the said receiver and laterally spaced from each other, the said receiver also being formed with an ejection-opening; a breech-bolt movable in the said receiver; a barrel projecting forwardly from the said receiver; an action-slide operatively connected to the said breech-bolt and provided with two parallel guide-ribs each sliding in one of the guide-grooves in the said receiver, the said action-slide having a forward position in which it covers the ejection-opening in the said receiver and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; and a rotary stop-member mounted adjacent the forward end of the said receiver and having stopmeans thereon normally projecting into the path of forward travel of the said action-slide, the said stop-member being rotatable in a direction transverse of the firearm-structure to shift the stopmeans thereof into and out of the path of forward movement of the said action-slide.

6. A'repeating firearm-structure including in combination: a receiver, formed on its exterior with two parallel guide-grooves extending longitudinally of the said receiver and laterally spaced from each other, the said receiver also being formed with an ejection-opening; a breechbolt movable in the said receiver; a barrel projecting forwardly from the said receiver; an

action-slide operatively connected to the said breech-bolt and provided with two parallel guideribs each sliding in one of the guide-grooves in the said receiver, the said actioneslide having a forward position in which it covers the ejectionopening in the said receiver and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward p0- sition; and a rotary stop-member mounted on the rear portion of the said barrel adjacent the forward end of the said receiver for turning movement .in a direction-transverse of the firearmstructure, the said stop-member" havin stopmeans thereon normally projecting into the path of forward travel of the said action-slide and movable out of the path of the said action-slide when the said stop-member is turned on the said barrel.

7. A repeating firearm-structure including in combination: a receiver formed on its exterior with two parallel guide-grooves extending longitudinally of the said receiver and laterally spaced from each other, the said receiver being formed with an ejection-opening; a breech-bolt movable in the said receiver; a barrel projecting forwardly from the said receiver and having external threads thereon located adjacent the forward end of the said receiver; an action-slide" operatively connected to the said breech-bolt and provided with two parallel guide-ribs each sliding in one of the guide-grooves in the said receiver, the said action-slide having a forward position in which it covers the ejection-opening in the said receiver and also having a rearward position in which the said action-slide uncovers the said ejectionopening; spring-means urging the said actionslide into its forward position; and an internallythreaded ring-like stop-member mounted on the threaded rear portion of the said barrel for turning movement thereon in a-direction transverse of the firearm-structure, the said stop-member having stop-means thereon normally projecting into the path of forward travel of the said actionslide and movable out of the path of the said action-slide when the said stop-member is turned on the said barrel.

8. A repeating firearm-structure including in combination: a receiver formed on its exterior with two parallel guide-grooves extending longitudinally of the said receiver and laterally spaced from each other, the said receiver also being formed with an ejection-opening; a breech-bolt movablein the said receiver; a barrel projecting forwardly from the said receiver; an action-slide operatively connected to the said breech-bolt and provided with two parallel guide-ribs each sliding in one of the guide-grooves in the said receiver, the said action-slide having a forward position in which it covers the ejection-opening in the said receiver and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; a rotary stop-member mounted adjacent the forward end of the said receiver and having stop-means thereon normally projecting into the path of forward travel of the said action-slide, the said stopmember being rotatable in a direction transverse of the firearm-structure to shift the stop-means thereof into and out of the path of forward movement of the said action-slide; and detent-means for releasably holding the said stop-member in position to interpose its stop-means in the path of the said action-slide and also for releasably' holding the stop-member in a position wherein its stop-means is out of the path of the said action-slide.

9. A repeating firearm-structure including in combination: a cylindrically-contoured receiver formed on its exterior with two parallel guidegrooves extending longitudinally of the said receiver and laterally spaced from each other, the said cylindrically-contoured receiver also being formed with an ejection-opening; a breech-bolt movable in the said receiver; a. barrel projecting forwardly from the said receiver; an action-slide operatively connected to the said breech-bolt and having-a. cylindrically-contoured inner face substantially conforming to'and bearing upon the cylindrical contour of the said' receiver, the said action-slide being provided with two parallel guide-ribs each sliding in one of the guide-grooves in the said cylindrically-contouredvreceiver, the said I action-slide having a forward position 'in whichit covers the ejection-opening in the said receiver and also having a rearward positionin which .the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into-its'forward position; and a, rotary stoprmember mounted adjacent the forward end of the said receiver and having stop-means thereon normally projecting int the path of forward travel' of the said action-slide, the said stop-memher being vrotatable in' a direction transverse of the firearmestructure to shift the stop-means thereof into and out of the path of forward move ment of the said action-slide. V

.10. A. repeating firearm-structure including in combination: a 'cylindri'callycontoured receiver formed on its exterior with two parallel guidegrooves extending longitudinally of the said receiver and laterally spaced from each other, the

-said cylindrically-contoured receiver also being formed with an ejection-opening; a breech-bolt movable in the said receiver; a barrel projecting forwardly from the said receiver; an action-slide operativeiy connected to the said breech-bolt and having a cylindrically-contoured inner face substantially conforming to and bearing upon the cylindrical contour of the said receiver, the said action-slide being provided with two parallel guide-ribs each sliding in one of the guide-grooves in the said cylindrically-contoured receiver, the said action-slide having a forward position in which it covers the ejection-opening in the said receiver and also having a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; and a rotary stop-member mounted on the rear portion of the said barrel adjacent the forward end of the said receiver for turning movement in a direction transverse of the firearm-structure, the said stopmember having stop-means thereon normally projecting into the path of forward travel of the said action-slide and movable out of the path of the said action-slide when the said stop-member is turned on the said barrel.

11. A repeating firearm-structure including in combination: a, cylindrically-contoured receiver formed on its exterior with two parallel guidegrooves extending longitudinally of the said receiver and laterally spaced from each other, the said cylindrically-contoured receiver also being formed with an ejection-opening; a breech-bolt movable in the said receiver; a barrel projecting forwardly from the said receiver and having ex ternal threads thereon located adjacent, the forward end of the said receiver; an action-slide operatively connected to the said breech-bolt and having a cylin'drically-contoured inner face substantially conforming to and bearing upon the cylindrical contour of the said receiver, the said action-slide being provided with two parallel guide-ribs each sliding in one of the guide-grooves in the said cylindrically-contoured receiver, the said action-slide having a forward position in which it covers the ejection-opening in the said receiver and also having a, rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; and an internallyethreaded ringelilse stop-member mounts ed'on the threaded rear portion of the said barrel for turning movement, thereon in a direction transverse of the firearm-structure, the said stop,- member havin stop-means thereon normally projecting into the path of forward travel of the said action-slide and movable out of the path of the saidactioneslide when the said stop-member is. turned on the said barrel.

12. A repeating firearm-structure includingv in combination; a, cylindrically-contoured receiver formed on its exterior with two parallel guides grooves extending longitudinally of the said receiver and laterally spaced from each other, the said receiver also being formed with an ejectionopening; a breech-bolt movable in the said receiver; a barrel projecting forwardly iron; the said receiver; an action-slide operatively connected to the said breech-bolt and provided with two paral-.- lel guide-ribs each sliding in one of the guiderooves in the said receiver, the said action-slide havin a cylindrieallyscontoured inner face substantially conforming to and bearing upon the cylindrical contour of the said receiver, the said action-slide having a. forward position in which it covers the ejection-opening in the said receiver and alsohaving a rearward position in which the said action-slide uncovers the said ejection-opening; spring-means urging the said action-slide into its forward position; a rotary stops-member mounted adjacent the forward end of the said receiver and having stop-means thereon normally projecting into the path of forward movement of the said action-slide, the said stop-member being rotatable in a direction transverse of the firearm-v structure to shift the stop-.means thereof into and out of the path of forward movement of the said action-slide; and detent-means for releasably holding the said stop-memberin position to interpose its stop-means in the path of the said action-slide and also for releasably holding the said stop-member in a position wherein its stopmeans is out of the path of the said action-slide,

CARL G. SWEBILIUS. 

